Promotion effect of nickel loaded on CdS for photocatalytic H 2 production in lactic acid solution

Nickel-based cocatalysts for photocatalytic hydrogen production

“…Nanoscaled Ni materials not only contribute an enlarged surface area and more active surface sites for interfacial electrochemical reactions, but also facilitate the charge migration and separation. In the past several decades, nanostructured Ni cocatalysts have been widely applied to combine with various semiconductors for efficient photocatalytic H 2 production [38][39][40][41][42][43][44][45][46][47][48][49], with some representative examples summarized in Table 1.…”

“…In particular, Ni-based materials demonstrate excellent activity and have received much attention as H 2 -evolution cocatalysts. Many kinds of Ni-based cocatalysts, such as metallic Ni [38][39][40][41][42][43][44][45][46][47][48][49], sulfides [50][51][52][53][54][55][56][57][58][59][60][61], phosphides [62], oxides [63][64][65][66][67][68][69], hydroxides [70][71][72][73][74][75][76][77], hydrogenases [78][79][80][81], as well as molecular complexes [81][82][83][84][85][86]…”

Structural Evolution during Photocorrosion of Ni/NiO Core/Shell Cocatalyst on TiO2

“…[6][7][8][9][10][11] Among all the photocatalytical water splitting co-catalyst systems, Ni based co-catalysts have been extensively applied and shown good photocatalytical properties. [12][13][14][15][16][17] It is also attractive because Ni is considerably less expensive than noble metals for water splitting and it has been extended to many different semiconductor systems like oxides of Ti, Nb and Ta photocatalysts. [18][19][20] Ni/NiO core-shell structure has apparently been shown to be one of the most active co-catalyst for water splitting.…”

Ni(OH)2 loaded on TaON for enhancing photocatalytic water splitting activity under visible light irradiation

“…Very recently, Yu et al [16,17] reported that Ni(OH) 2 , Cu(OH) 2 (so called noble-metal-free) cocatalysts could significantly improve the hydrogen evolution activity on TiO 2 and CdS. We also found that the hydrogen evolution rate of Ni/CdS was 12 times of pure CdS [18], indicating noble-metal-free cocatalysts such as Ni, Ni(OH) 2 or Cu(OH) 2 could be used as substitutes for noble metal cocatalysts in photocatalytic water splitting for hydrogen production. Considering the advantages of TaON in photocatalytic water splitting such as non-toxic, high stability, visible-light-driven, it is very necessary to investigate the effect of Ni(OH) 2 loading on TaON.…”

“…On the other hand, owing to the more positive reduction potential of Ni 2+ /Ni than CB potential of TaON, partial Ni 2+ is reduced to Ni metal(Ni 0 ) by electrons from TaON during the hydrogen evolution process. These Ni 0 can also act as a cocatalyst to promote the separation of electrons and holes like Ni(OH) 2 [18,34]. Moreover, due to very active property, Ni metal is easily oxidized when it is exposed to the air, so the Ni species after reaction was detected in the form of NiO.…”